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It is possible to create different files of any arbitrary size on a unix or linux machine using the "dd" command.

Below is an example:

$ cd /tmp
then execute following command.
$ dd if=/dev/zero of=testfile bs=1024 count=100

This above command will create a file of size 1024 * 100 bytes.

In this command the description about the syntax of command is as explained below,

* if = It is input file.
* of = It is output file or the file to be created, you can give any name.
* bs = It is the block size in bytes.
* count = It is the no of blocks of size bs.

For more detail information for using of dd command see the man pages of dd command.

$ man dd